mirror of
https://github.com/torvalds/linux.git
synced 2024-12-13 06:32:50 +00:00
bc36442ef3
This adds three tests for MSG_ZEROCOPY feature: 1) SOCK_STREAM tx with different buffers. 2) SOCK_SEQPACKET tx with different buffers. 3) SOCK_STREAM test to read empty error queue of the socket. Patch also works as preparation for the next patches for tools in this patchset: vsock_perf and vsock_uring_test: 1) Adds several new functions to util.c - they will be also used by vsock_uring_test. 2) Adds two new functions for MSG_ZEROCOPY handling to a new source file - such source will be shared between vsock_test, vsock_perf and vsock_uring_test, thus avoiding code copy-pasting. Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
88 lines
2.0 KiB
C
88 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/* Some common code for MSG_ZEROCOPY logic
|
|
*
|
|
* Copyright (C) 2023 SberDevices.
|
|
*
|
|
* Author: Arseniy Krasnov <avkrasnov@salutedevices.com>
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <linux/errqueue.h>
|
|
|
|
#include "msg_zerocopy_common.h"
|
|
|
|
void enable_so_zerocopy(int fd)
|
|
{
|
|
int val = 1;
|
|
|
|
if (setsockopt(fd, SOL_SOCKET, SO_ZEROCOPY, &val, sizeof(val))) {
|
|
perror("setsockopt");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
void vsock_recv_completion(int fd, const bool *zerocopied)
|
|
{
|
|
struct sock_extended_err *serr;
|
|
struct msghdr msg = { 0 };
|
|
char cmsg_data[128];
|
|
struct cmsghdr *cm;
|
|
ssize_t res;
|
|
|
|
msg.msg_control = cmsg_data;
|
|
msg.msg_controllen = sizeof(cmsg_data);
|
|
|
|
res = recvmsg(fd, &msg, MSG_ERRQUEUE);
|
|
if (res) {
|
|
fprintf(stderr, "failed to read error queue: %zi\n", res);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
cm = CMSG_FIRSTHDR(&msg);
|
|
if (!cm) {
|
|
fprintf(stderr, "cmsg: no cmsg\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (cm->cmsg_level != SOL_VSOCK) {
|
|
fprintf(stderr, "cmsg: unexpected 'cmsg_level'\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (cm->cmsg_type != VSOCK_RECVERR) {
|
|
fprintf(stderr, "cmsg: unexpected 'cmsg_type'\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
serr = (void *)CMSG_DATA(cm);
|
|
if (serr->ee_origin != SO_EE_ORIGIN_ZEROCOPY) {
|
|
fprintf(stderr, "serr: wrong origin: %u\n", serr->ee_origin);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (serr->ee_errno) {
|
|
fprintf(stderr, "serr: wrong error code: %u\n", serr->ee_errno);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* This flag is used for tests, to check that transmission was
|
|
* performed as expected: zerocopy or fallback to copy. If NULL
|
|
* - don't care.
|
|
*/
|
|
if (!zerocopied)
|
|
return;
|
|
|
|
if (*zerocopied && (serr->ee_code & SO_EE_CODE_ZEROCOPY_COPIED)) {
|
|
fprintf(stderr, "serr: was copy instead of zerocopy\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (!*zerocopied && !(serr->ee_code & SO_EE_CODE_ZEROCOPY_COPIED)) {
|
|
fprintf(stderr, "serr: was zerocopy instead of copy\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
}
|